Elimination Method in Systems of Equations

The video tutorial introduces the elimination method for solving systems of equations, providing easy, medium, and hard examples. The instructor explains the process, offers tips, and highlights common mistakes. The method involves combining equations to eliminate a variable, focusing on achieving zero as a coefficient. The tutorial emphasizes the addition method over subtraction to avoid errors. The final example tackles systems with fractions, demonstrating how to simplify and solve them effectively.

What is the primary goal of the elimination method in solving systems of equations?

• To find the determinant of the system

• To eliminate one variable by making its coefficient zero

• To convert the system into a matrix form

• To graph the equations and find the intersection

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When using the elimination method, what is a common mistake students make?

• Forgetting to multiply both sides of the equation

• Not checking the solution by substitution

• Eliminating the wrong variable

• Using the wrong sign when adding or subtracting equations

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CCSS.8.EE.C.8B

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What should you do if the coefficients of the variables are not suitable for elimination?

• Add a constant to both equations

• Switch to a different method like substitution

• Adjust the coefficients by multiplying the equations

• Ignore the coefficients and solve directly

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In the elimination method, why is it beneficial to have one positive and one negative coefficient?

• It simplifies the addition process

• It ensures the solution is unique

• It helps in graphing the equations

• It reduces the number of steps needed

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CCSS.8.EE.C.8B

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How can you simplify a system of equations that includes fractions?

• Ignore the fractions and solve the system

• Add the fractions directly

• Multiply by a common denominator to eliminate fractions

• Convert the fractions to decimals

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CCSS.8.EE.C.8B

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What is the first step when dealing with a system of equations that includes fractions?

• Convert all fractions to decimals

• Find a common denominator and multiply through

• Add the fractions together

• Ignore the fractions and solve the system

What is the least common multiple of 3 and 5?

• 20

• 10

• 25

• 15

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What is the solution to the system of equations if x = 5/4 and y = -3/2?

• (3/2, -5/4)

• (-3/2, 5/4)

• (5/4, -3/2)

• (-5/4, 3/2)

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Why is it important to check your solution after using the elimination method?

• To make sure the solution is a whole number

• To verify the graph of the solution

• To ensure the solution satisfies both original equations

• To confirm the determinant is zero

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CCSS.8.EE.C.8B

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What is a key strategy when dealing with complex systems of equations?

• Use trial and error to find the solution

• Focus on eliminating fractions first

• Always use the substitution method

• Graph the equations to find the solution

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